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提出了一种近零色散平坦微结构光纤(MF)。运用有限元法(FEM),研究了空气孔直径和间隔对光纤色散特性的影响。通过控制空气孔间距和孔直径,可以实现宽波段内的低平色散传输和大的模场面积。当空气孔直径d=0.73μm,空气孔间距Λ=2.2μm时,在1.22～1.80μm约600 nm的波长范围内,光纤的色散系数D的值仅介于±1 ps/(nm.km)之间,且有三个零色散波长1.26,1.51和1.76μm;当d=0.73μm,Λ=2.3μm时,在1.20～1.65μm约400 nm的波长范围内,D的值仅介于-2～4 ps/(nm.km)之间,且有一个零色散波长1.24μm等。
A near zero dispersion flat microstructured fiber (MF) is proposed. Finite element method (FEM) was used to study the influence of air hole diameter and spacing on the dispersion characteristics of optical fiber. By controlling the spacing of the air holes and the diameter of the holes, it is possible to achieve low-level dispersion transmission and a large mode field area in a wide wavelength band. When the air hole diameter d = 0.73μm and the air hole spacing Λ = 2.2μm, the dispersion coefficient D of the optical fiber is only ± 1 ps / (nm.km) in the range of 1.22 ~ 1.80μm and about 600 nm. , And there are three zero-dispersion wavelengths of 1.26,1.51 and 1.76μm. When d = 0.73μm and Λ = 2.3μm, the value of D is only between -2 and -1 in the wavelength range of 1.20 ~ 1.65μm and about 400 nm, 4 ps / (nm.km), and has a zero dispersion wavelength of 1.24μm and so on.